Nexus 5 stuck in boot loop and cant access boot loader

i flashed the latest nightly of AOKP today and then restored all my apps and data with titanium backup. When the restore was complete it prompted me to reboot my device so i did. ever since then i have been unable to reboot my phone as it is stuck on the start up screen. i then tried to restore from a backup of my other rom and then found out that i couldn't boot into the boot loader as when i held down the power and + volume button the startup would begin and then the phone would turn off. any ideas on how to fix this.

What it's happening is your stuck in a boot loop.
When you are holding power and volume down the phone is only interested in the power button part. Which is why it's powering off.
Just keep the buttons held both power and volume down. When it powers off keep them held and you should come into the bootloader

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